On Wed, 2008-10-29 at 20:42 -0700, Neil Brown wrote:
> To fit the assembly of a specific member of a container into this
> model, we need to have the 'container' in the list of available
> devices.
> If the identity specifies 'container=whatever' then we clearly select
> all devices which match that. You would expect at exactly one - the
> container. You would then need to call ->container_content on that
> container and find the correct member array which matches the
> 'member=' specifier (or any other specifier there might be?)
>
> Exactly how updates and "--force" are passed though would need to be
> sorted out.
> Then the devices in the selected array from ->container_content could
> be passed to sysfs_add_disk and the array started.
>
> Auto-assembly would discover that the first unused-so-far device was a
> container, and would need to load the list of arrays and assemble the
> first one that was not yet assembled.
>
I had a go at this, and the result is pushed out to my scratch-devel
branch. mdadm can now:
1/ Scan and assemble container members
mdadm -Es > mdadm.conf
cat mdadm.conf
ARRAY metadata=imsm auto=md UUID=88f0b659-966978a7-842f86c0-879a414d
ARRAY /dev/md/r1 container=88f0b659-966978a7-842f86c0-879a414d
member=0 auto=mdp UUID=42d6de62-bd27b267-96e8e960-13efc3a6
ARRAY /dev/md/r2 container=88f0b659-966978a7-842f86c0-879a414d
member=1 auto=mdp UUID=b0764c97-8b4fdf0e-0821862e-a80f1452
mdadm -Asc mdadm.conf
mdadm: Container /dev/md/imsm127 has been assembled with 6 drives
mdadm: Started /dev/md/r1 with 6 devices
mdadm: Started /dev/md/r2 with 6 devices
2/ Assemble member array by uuid
mdadm -A /dev/md/r1 /dev/md/imsm -a mdp -u 42d6de62-bd27b267-96e8e960-13efc3a6
3/ Auto-assemble member arrays as foreign arrays
This still does not handle updates or --force... it seems awkward to try
and support --force at anything other than the container level, but that
is the extent of my thinking so far.
The following changes since commit fb9253084ab0b9e4ac1113e4fc8f0b88d818d4f8:
NeilBrown (1):
mdopen: fix up name parsing.
are available in the git repository at:
git://git.kernel.org/pub/scm/linux/kernel/git/djbw/mdadm.git scratch-devel
Dan Williams (21):
Quiet uninitialized variable warnings
Makefile: fixup install of udev rules
imsm: match_home(), document why it is stubbed out
Let symlinks to standard devices count as standard names
imsm: display member array uuid in examine_super_imsm
imsm: display container uuid in detail_super
config: add 'containers' as a DEVICE keyword
Add a 'container' flag to mddev_dev_t
Assemble: check if the devlist entry is a container
Assemble: let trustworthy be LOCAL when array is identified
Assemble: replace 'info' with 'content'
Assemble: teach it to look inside containers for matching arrays
Assemble: discard non-container devices when not required
cleanup an unused call to container2devname
config: add containers to the default search list
Assemble: revert preliminary -As support
Copy container_dev in dup_super
Assemble: factor out and call assemble_container_content
fixup create_mddev
Assemble: block attempts to reassemble container members
Assemble: enable member array auto-assembly
Assemble.c | 428 ++++++++++++++++++++++++++++++++++++++-------------------
Incremental.c | 99 +------------
Makefile | 4 +-
config.c | 46 ++++++-
mdadm.c | 1 +
mdadm.h | 17 ++-
mdmon.c | 9 ++
mdopen.c | 7 +-
super-intel.c | 37 ++++--
util.c | 155 ++++++++++++++++++++-
10 files changed, 542 insertions(+), 261 deletions(-)
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